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Indirect Measurement of Plant Height in Cotton (Gossypium hirsutum) Pam Turner Oklahoma State University.

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Presentation on theme: "Indirect Measurement of Plant Height in Cotton (Gossypium hirsutum) Pam Turner Oklahoma State University."— Presentation transcript:

1 Indirect Measurement of Plant Height in Cotton (Gossypium hirsutum) Pam Turner Oklahoma State University

2 M-5000/95 Conical Beam Angle 8 o Min. Distance 1 ft Max. Distance 13 ft Output units 20 mAmps Operating temp. -20 o C to 65 o C ‘MassaSonic’ Ultrasonic Sensor

3 1)Measure and record height from ground to face of sensor 2)Place sensor over plant. It must be 4 – 40 inches from the plant. 3)Record reading provided by sensor (mAmps). Fifty readings are taken at each growth stage. 4)Convert mAmps to inches. = x Voltage Reading ) Value subtracted from sensor height to give plant height. Sonar Measurement Methods

4 Hand Measurement 1)Measure and record the distance between plant and face of sensor. 2)Using Microsoft Office Excel, subtract height of sensor from hand measured height to get plant height. Methods

5 Growth Stage: 17 Leaf Sensor Height: in. (120 cm) from ground View Diameter 6.59 cm

6 Growth Stage: Square Growth Midpoint Sensor Height: 41.5 in. (105.4 cm) from ground View Diameter 5.79 cm

7 Growth Stage: White Bloom Sensor Height: 43 in. (109.2 cm) from ground View Diameter 5.99 cm

8 Growth Stage: Flowering 5-7 Days Sensor Height: 43 in. (109.2 cm) from ground View Diameter 5.99 cm

9 Growth Stage: Developing Boll Sensor Height: 42.5 in. (107.9 cm) from ground View Diameter 5.92 cm

10 Growth Stage: Developing Boll Sensor Height: 55 in. (139.7 cm) from ground View Diameter 7.67 cm

11 Cotton Sonar Height y = 0.96x R 2 = 0.95

12 Plant Development Leaf Square Growth Midpoint Developing Boll

13 Conclusions Where OSU cotton research is going… Establish relationship between measuring plants by hand and measuring plants with ultrasonic sensor Develop a benchmark setting for cotton to look at plant or target biomass NDVI Establish a method for yield prediction


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